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The combined effects of cross-phase modulation and pulse walk-off on copropagating optical pulses are investigated. It is shown that ultrafast pulses which overlap in a nonlinear dispersive medium undergo a substantial shift of their carrier frequencies. This new coherent phenomenon of induced-frequency shift has been demonstrated using strong infrared picosecond pulses which shift the frequency of weak green picosecond pulses propagating in a 1-m-long single-mode optical fiber.
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Baldeck et al. (1988) studied this question.
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